How Does A Hoist Work?

 Date: 08/06/2019

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IDENTIFYING THE KEY PARTS OF THE HOIST

Not sure how a hoist works? Use the two graphs to follow the steps listed below to learn more. Still have questions? Contact R&M!

Identifying the key parts of the hoist

Parts of a hoist chart

 

Hoisting Function

Hoisting Function Photo

Hoist functions chart

 

How the hoisting function works

  • When the relevant button or joystick is activated on the pendant or radio controller (1), the hook (12) moves vertically provided that certain conditions are met.
  • The product has a variety of automatic built-in safety features which, for example, prevent lifting overload, limit travelling movements or prevent all the movements if the emergency stop button (13) is engaged. In addition, there can be operating limits (set by the owner/operator) which also limit movements under certain conditions.
  • When a hoisting button or joystick is activated on the controller (1), a command is sent to the electric panel (2).
  • The direction (up of down) of the hoist depends on which button or joystick is pressed. The speed of the hoist depends on which step is activated.
  • The electric panel (2) controls the brake (3) and motor (4) in accordance with inputs from the operator, together with signals from the sensors and safety devices.
  • When the motor (4) is not being driven, the brake (3) holds the motor in place, preventing it from turning unintentionally and the load from sliding down.
  • When a signal is transmitted from the controller (1), the electric panel (2) supplies power to the motor (4) and releases the brake.
  • The motor (4) drives the hoisting gear (5) which drives the hoisting drum (6). The hoisting gear (5) reduces the rotation speed and increases the torque to lift the load. 
  • The wire rope (10) winds or unwinds when the hoist drum (6) rotates. The rope guide (7) guides the wire rope into the correct groove of the drum.
  • One end of the rope is fixed to the hoisting drum (6) with a rope clamp (8). The other end of the rope is connected to the rope anchorage (9).
  • The rope passes around the rope sheaves (11) into the rope anchorage (9). The hook block rises and falls when the rope winds onto or unwinds from the hoisting drum (6).
  • In normal use, when the up or down control is released on the controller (1), the control closes the main brake and brings the hoist to a gradual, controlled stop.
  • In emergency situations, the emergency stop button (13) on the controller (1) can be activated. This causes an instant stop of all movements by cutting power to the motors and applying the brakes.